<template>
	<view>
    <view class="search-box">
		  <uni-search-bar  :radius="100"  @input="input" cancelButton='none' ></uni-search-bar>
	  </view>
    <!-- 搜索建议 -->
    <view class="sugg-list" v-if="searchResults.length!==0">
      <view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
        <view class="goods_name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    <!-- 搜索历史 -->
    <view class="search-history" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
         <uni-icons type="trash" size="16" @click="clear"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag :text='item' v-for="(item,i) in historys" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
	export default {
		data() {
			return {
        // 延时器
				timer:null,
        // 关键字
        kw:'',
        // 搜索结果列表
        searchResults:[],
        // 搜索关键字历史记录
        historyList:[]
			};
		},
    computed:{
      historys(){
        return [... this.historyList].reverse()
      }
    },
    onLoad() {
      this.historyList=JSON.parse(uni.getStorageSync('kw')||'[]')
    },
    methods:{
      input(e){
        //解决防抖问题 也叫延时器
        clearTimeout(this.timer)
        this.timer= setTimeout(()=>{
          this.kw=e.value
          this.getSearchList()
          // console.log(e.value)
        },500)
      },
      //获取关键词
      async getSearchList(){
        if(this.kw.length===0){
          this.searchResults=[]
          return
        }
       const {data:res}=await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
        if(res.meta.status!==200) return uni.$showMsg()
        this.searchResults=res.message
        this.saveSearchHistory()
      },
      gotoDetail(item){
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?goods_id='+item.goods_id
        })
      },
      saveSearchHistory(){
        // this.historyList.push(this.kw)
        // 解决搜索关键字重复问题
        // 将数组转化成set对象
        const set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList = Array.from(set)  
        // 调用uni.setStorageSync(key,value)将搜索历史记录持久化存储到本地
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      clear(){
        this.historyList=[]
        // 把storage里面的数据也清空掉
        uni.setStorageSync('kw','[]')
      },
      gotoGoodsList(kw){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query='+kw
        })
      }
    }
	}
</script>

<style lang="scss">
.search-box{
  position: sticky;
  top: 0;
  z-index: 999;
}
.sugg-list{
  padding: 0 5px;
  .sugg-item{
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 13px 0;
    font-size: 12px;
    border-bottom: 1px solid #efefef;
    .goods_name{
      //文字不允许换行
      white-space: nowrap;
      // 超出部分隐藏
      overflow: hidden;
      // 超出部分采用小...
      text-overflow: ellipsis;
      margin-right: 3px;
    }
  }
}
.search-history{
  padding: 0 5px;
  .history-title{
    display: flex;
    justify-content: space-between;
    line-height: 40px;
    height: 40px;
    font-size:13px ;
    border-bottom: 1px solid #efefef;
  }
  .history-list{
    display: flex;
    flex-wrap: wrap;
    .uni-tag{
      margin-top: 5px;
      margin-right: 5px;
    }
  }
}

</style>
